scholarly journals Ultrasonic imaging of seismic physical models using a fringe visibility enhanced fiber-optic Fabry-Perot interferometric sensor

2018 ◽  
Vol 26 (8) ◽  
pp. 11025 ◽  
Author(s):  
Wenlu Zhang ◽  
Fengyi Chen ◽  
Wenwen Ma ◽  
Qiangzhou Rong ◽  
Xueguang Qiao ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Ultrasonic Imaging ◽  
Physical Models ◽  
Fringe Visibility ◽  
Fabry Perot ◽  
Interferometric Sensor

scholarly journals Fringe Visibility Enhanced Fiber-Optic Fabry-Perot Interferometric Sensor for Highly Sensitive Ultrasound Detection

Proceedings ◽  
2017 ◽  
Vol 1 (8) ◽  
pp. 808
Author(s):  
Xueguang Qiao ◽  
Wenlu Zhang ◽  
Ruohui Wang ◽  
Qiangzhou Rong ◽  
Zhihua Shao ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fringe Visibility ◽  
Highly Sensitive ◽  
Fabry Perot ◽  
Interferometric Sensor

scholarly journals A High-Speed Demodulation Technology of Fiber Optic Extrinsic Fabry-Perot Interferometric Sensor Based on Coarse Spectrum

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6609
Author(s):  
Peng Zhang ◽  
Ying Wang ◽  
Yuru Chen ◽  
Xiaohua Lei ◽  
Yi Qi ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Likelihood Estimation ◽  
Time Dynamic ◽  
Wavelength Division ◽  
Broadband Spectrum ◽  
Fabry Perot ◽  
Interferometric Sensor

A fast real-time demodulation method based on the coarsely sampled spectrum is proposed for transient signals of fiber optic extrinsic Fabry-Perot interferometers (EFPI) sensors. The feasibility of phase demodulation using a coarse spectrum is theoretically analyzed. Based on the coarse spectrum, fast Fourier transform (FFT) algorithm is used to roughly estimate the cavity length. According to the rough estimation, the maximum likelihood estimation (MLE) algorithm is applied to calculate the cavity length accurately. The dense wavelength division multiplexer (DWDM) is used to split the broadband spectrum into the coarse spectrum, and the high-speed synchronous ADC collects the spectrum. The experimental results show that the system can achieve a real-time dynamic demodulation speed of 50 kHz, a static measurement root mean square error (RMSE) of 0.184 nm, and a maximum absolute and relative error distribution of 15 nm and 0.005% of the measurement cavity length compared with optical spectrum analyzers (OSA).

Fiber-optic endoscopic ultrasonic imaging of pipe-type seismic physical models

2020 ◽  
Vol 132 ◽  
pp. 106479
Author(s):  
Zhihua Shao ◽  
Wenxuan Wang ◽  
Fengyi Chen ◽  
Xueguang Qiao
Keyword(s):  
Fiber Optic ◽  
Ultrasonic Imaging ◽  
Physical Models

Micro Extrinsic Fiber-Optic Fabry-Perot Interferometric Sensor Based on Erbium- and Boron-Doped Fibers

2010 ◽  
Vol 27 (2) ◽  
pp. 024208 ◽  
Author(s):  
Rao Yun-Jiang ◽  
Xu Bing ◽  
Ran Zeng-Ling ◽  
Gong Yuan
Keyword(s):  
Fiber Optic ◽  
Boron Doped ◽  
Fabry Perot ◽  
Doped Fibers ◽  
Interferometric Sensor
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